<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./lib/vue-2.4.0.js"></script>
</head>

<body>
    <div id="app">
        <!-- v-if：每次都会创建元素， v-show：增加display:none样式 -->
        <input type="button" value="变化" @click="c">
        <h3 v-if="flag">v-if</h3>
        <h3 v-show="flag">v-show</h3>
    </div>

    <script>
        var vm = new Vue({
            el: '#app ',
            data: {
                flag: true,
            },
            methods: {
                c() {
                    this.flag = !this.flag
                }
            }
        });
    </script>
</body>

</html>